v0.0.40: [Benchmark] Improve PostgreSQL connector.
- Do not `kill()` while handling `TimeoutExpired`. This should happen only in `finally` and after an attempt at graceful termination. - Properly dispose of connections by `del`-eting them.
- Do not `kill()` while handling `TimeoutExpired`. This should happen only in `finally` and after an attempt at graceful termination. - Properly dispose of connections by `del`-eting them.